Connected: An Internet Encyclopedia
RFC 1423 - 5. Descriptive Grammar

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### 5. Descriptive Grammar

       ; Addendum to PEM BNF representation, using RFC 822 notation
       ; Provides specification for official PEM cryptographic algorithms,
       ; modes, identifiers and formats.

       ; Imports <hexchar> and <encbin> from RFC [1421]

           <dekalgid> ::= "DES-CBC"
           <ikalgid>  ::= "DES-EDE" / "DES-ECB" / "RSA"
           <sigalgid> ::= "RSA"
           <micalgid> ::= "RSA-MD2" / "RSA-MD5"

           <dekparameters> ::= <DESCBCparameters>
           <DESCBCparameters> ::= <IV>
           <IV> ::= <hexchar16>

           <symencdek> ::= <DESECBencDESCBC> / <DESEDEencDESCBC>
           <DESECBencDESCBC> ::= <hexchar16>
           <DESEDEencDESCBC> ::= <hexchar16>

           <symencmic> ::= <DESECBencRSAMD2> / <DESECBencRSAMD5>
           <DESECBencRSAMD2> ::= 2*2<hexchar16>
           <DESECBencRSAMD5> ::= 2*2<hexchar16>

           <asymsignmic> ::= <RSAsignmic>
           <RSAsignmic> ::= <encbin>

           <asymencdek> ::= <RSAencdek>
           <RSAencdek> ::= <encbin>

           <hexchar16> ::= 16*16<hexchar>

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Connected: An Internet Encyclopedia
RFC 1423 - 5. Descriptive Grammar